Washington -- President Bush has accepted “with deep regret” the resignation of U.S. Representative to the United Nations John Bolton.

In a statement released by the White House December 4, the president credited Bolton with leading negotiations in the U.N. Security Council that resulted in unanimous resolutions on North Korean military and nuclear activities, a resolution calling on Iran to suspend the enrichment and reprocessing of uranium, and a U.N. peacekeeping commitment to Sudan.

Bolton was appointed to the post in August 2005 during a period when the U.S. Senate, which normally would vote on the nomination, was in recess.  Under the U.S. Constitution, a president may make temporary recess appointments without Senate confirmation.

The president re-nominated Bolton on November 9, but administration officials believed that his nomination did not have enough support in the Senate Foreign Relations Committee to come to the full Senate for a confirmation vote.

Bush said some senators were practicing “stubborn obstructionism” by “obstruct[ing] his confirmation” despite Bolton having the support of the majority of the Senate.  “[T]heir tactics will disrupt our diplomatic work at a sensitive and important time,” Bush said.

White House press secretary Tony Snow blamed Bolton’s difficulties in the Senate on “partisanship and not performance,” adding, “for whatever reason the confirmation process seems to be broken.”

The press secretary called on both Republicans and Democrats in the Senate to cooperate on “a confirmation process that allows competent people who share the president’s goals and policies to become confirmed for key positions.”